diff --git a/lib/constants.js b/lib/constants.js
index 700db74..4401e56 100644
--- a/lib/constants.js
+++ b/lib/constants.js
@@ -6,6 +6,7 @@ class Constants {
     static SYSTEM_CHECK_URL     = `${Constants.BASE_URL}/index_check.html`
     static MAIN_PAGE_URL        = `${Constants.BASE_URL}/common.do?method=main`
     static LOGIN_REQUEST_URL    = `${Constants.BASE_URL}/userSsl.do?method=login`
+    static PW_CHANGE_NEXT_URL   = `${Constants.BASE_URL}/userSsl.do?method=pspnPwChng`
     static BUY_PAGE_URL         = `${Constants.API_URL}/olotto/game/game645.do`
     static BUY_LOTTO_645_URL    = `${Constants.API_URL}/olotto/game/execBuy.do`
     static BUY_READY_SOCKET_URL = `${Constants.API_URL}/olotto/game/egovUserReadySocket.json`
diff --git a/lib/lotto.js b/lib/lotto.js
index df4651a..c9ed8d0 100644
--- a/lib/lotto.js
+++ b/lib/lotto.js
@@ -62,7 +62,34 @@ class Lotto {
         if(loginResult instanceof Error)
             return loginResult
 
-        const $ = Cheerio.load(loginResult.data)
+        let $ = Cheerio.load(loginResult.data)
+
+        /**
+         * 비밀번호 변경 감지
+         *
+         * 비밀번호가 변경이 될 경우 'https://www.dhlottery.co.kr/userSsl.do?method=pwdPlyChngNoti'로 redirect 됨
+         * 비밀번호를 유지할 지 변경할 지 고르는 페이지인데, 여기에 있는 chngTgtId 및 pwdChgToken를 추출해서
+         *
+         * POST 'https://www.dhlottery.co.kr/userSsl.do?method=pspnPwChng'
+         * payload로 chngTgtId, pwdChgToken을 보내면 다음에 하기 처리됨.
+         *
+         * 성공하면 'https://www.dhlottery.co.kr/user.do?method=login&returnUrl=https%3A%2F%2Fwww.dhlottery.co.kr%2Fcommon.do%3Fmethod%3Dmain'
+         * redirect 진행되며, 마지막으로 MAIN_PAGE_URL로 redirect됨
+         */
+        const targetInput = $('#chngTgtId')
+        if(targetInput.length !== 0) {
+            const chngTgtId = targetInput.val()
+            const pwdChgToken = $('#pwdChgToken').val()
+
+            const pwChgNextData = { chngTgtId, pwdChgToken }
+            const pgChgNextResult = await this.#_request('POST', Constants.PW_CHANGE_NEXT_URL, pwChgNextData)
+            if(pgChgNextResult instanceof Error)
+                return pgChgNextResult
+
+            $ = Cheerio.load(pgChgNextResult.data)
+        }
+
+
         const btnCommonElements = $('a.btn_common')
         if(btnCommonElements.length > 0)
             return new Error('로그인에 실패했습니다. 아이디 또는 비밀번호를 확인해주세요.')